Well, not sure this will help you or not. We inherited some mineral rights on over 5,000 acres of TX land many years ago. Darn, I thought I might be rich. Then I read how much we owned, and it was like 1/275,000 share in it, so it wasn't much.
I'm not familiar with a 'non-drilling' lease, but my guess is it will keep your property from exploration. It will pay you a little to assure that your neighbor gets more.............
And likely if this area is in play, you will receive offers out the kazoo from people wanting to buy your rights, or lease from you.
Almost yearly, we receive unsolicited offers that amount to about 4 yrs of our current royalites. We haven't considered any of them.
Royalty stuff is a PITA to compute on tax forms (easy is you use a CPA I suppose).
The one thing you can count on is the guys doing it are looking out for Number One --THEMSELVES.
I suggest you find a local expert, maybe a lawyer who deals in royalties and leases to gain some insite. It might earn you some more money. Rest assured, the offer you received is not the best one out there, even from this same company...........
Hope this helps ya.
Ron